Moving Windows security info to new page

Signed-off-by: Mark Rossetti <[email protected]>

Author: marosset

content/en/docs/concepts/security/windows-security.md

@@ -0,0 +1,55 @@
+---
+reviewers:
+- jayunit100
+- jsturtevant
+- marosset
+- perithompson
+title:    Security For Windows Nodes
+content_type: concept
+weight: 75
+---
+
+<!-- overview -->
+
+This page describes security considerations and best practices specific to the Windows operating system.
+
+<!-- body -->
+
+## Protection for Secret data on nodes
+
+On Windows, data from Secrets are written out in clear text onto the node's local
+storage (as compared to using tmpfs / in-memory filesystems on Linux). As a cluster
+operator, you should take both of the following additional measures:
+
+1. Use file ACLs to secure the Secrets' file location.
+1. Apply volume-level encryption using [BitLocker](https://docs.microsoft.com/windows/security/information-protection/bitlocker/bitlocker-how-to-deploy-on-windows-server).
+
+## Container users
+
+[RunAsUsername](/docs/tasks/configure-pod-container/configure-runasusername)
+can be specified for Windows Pods or containers to execute the container
+processes as specific user. This is roughly equivalent to
+[RunAsUser](/docs/concepts/policy/pod-security-policy/#users-and-groups).
+
+Windows containers offer two default user accounts, ContainerUser and ContainerAdministrator.
+The differences between these two user accounts are covered in
+[When to use ContainerAdmin and ContainerUser user accounts](https://docs.microsoft.com/virtualization/windowscontainers/manage-containers/container-security#when-to-use-containeradmin-and-containeruser-user-accounts) within Microsoft's _Secure Windows containers_ documentation.
+
+Local users can be added to container images during the container build process.
+
+{{< note >}}
+
+* [Nano Server](https://hub.docker.com/_/microsoft-windows-nanoserver) based images run as `ContainerUser` by default
+* [Server Core](https://hub.docker.com/_/microsoft-windows-servercore) based images run as `ContainerAdministrator` by default
+
+{{< /note >}}
+
+Windows containers can also run as Active Directory identities by utilizing [Group Managed Service Accounts](/docs/tasks/configure-pod-container/configure-gmsa/)
+
+## Pod-level security isolation
+
+Linux-specific pod security context mechanisms (such as SELinux, AppArmor, Seccomp, or custom
+POSIX capabilities) are not supported on Windows nodes.
+
+Privileged containers are [not supported](#compatibility-v1-pod-spec-containers-securitycontext) on Windows.
+Instead [HostProcess containers](/docs/tasks/configure-pod-container/create-hostprocess-pod) can be used on Windows to perform many of the tasks performed by privileged containers on Linux.

content/en/docs/setup/production-environment/windows/intro-windows-in-kubernetes.md

@@ -684,24 +684,6 @@ Windows Server SAC release
 
 The Kubernetes [version-skew policy](/docs/setup/release/version-skew-policy/) also applies.
 
-## Security for Windows nodes {#security}
-
-On Windows, data from Secrets are written out in clear text onto the node's local
-storage (as compared to using tmpfs / in-memory filesystems on Linux). As a cluster
-operator, you should take both of the following additional measures:
-
-1. Use file ACLs to secure the Secrets' file location.
-1. Apply volume-level encryption using [BitLocker](https://docs.microsoft.com/en-us/windows/security/information-protection/bitlocker/bitlocker-how-to-deploy-on-windows-server).
-
-[RunAsUsername](/docs/tasks/configure-pod-container/configure-runasusername)
-can be specified for Windows Pods or containers to execute the container
-processes as a node-default user. This is roughly equivalent to
-[RunAsUser](/docs/concepts/policy/pod-security-policy/#users-and-groups).
-
-Linux-specific pod security context privileges such as SELinux, AppArmor, Seccomp, or capabilities (POSIX capabilities), and others are not supported.
-
-Privileged containers are [not supported](#compatibility-v1-pod-spec-containers-securitycontext) on Windows.
-
 ## Getting help and troubleshooting {#troubleshooting}
 
 Your main source of help for troubleshooting your Kubernetes cluster should start